Locking-pulley.



No; 887,344. PATENTBD MAY 12, 1908.

' P. A. NELSON.

LOCKING PULLBY.

APPLICATION FILED OUT. 11,1907,

' net, county of Bureau, and State [PETER A.

PATENT OFFICE.

NELSON, OF WYANET, ILLINOIS.

LOCKING-PULLEY.

Specification of Letters Patent.

Patented May 12, 1908.

Application filed October 11, 1907. Serial No. 396,962.

To all whom it meyroacer'n:

Be it known that I, PETER A. NELSON, a citizen of the United States, residing at Wyaof Illinois, have invented certain new and useful Improvements in Locking-Pulleys, of which the following is a specification, reference being bad therein to the accompan 'ng drawing.

This invention relates to a ocking pulley, and particularly to an improved construction of the'locking block.

The invention has for an object to rovi'de a novel and improved construction of ocking block and operating arm therefrom provided with a curved face over which the rope rides,

, and an engaging socket into which the rope may be drawnfor )ositively actuating the block if the latter ecomes too firmly engaged'with the rope.

Other and further objects and advantages of the invention will be hereinafter fully set forth and the novel features thereof'defined by the appended claims:

In the drawing :Figure 1 is a perspective showing the pulley; Fig. 2 is a vertical section therethrough; Fig. 3 is a detail of the locking block and arm therefrom.

Like numerals refer to like parts in the several figures of the drawing.

The numeral 10 designates the pulley casing which may be of any desired construction or configuration and is provided with the slot or passage thereth'rough within which the wheel or sheave 1 1 is pivot-ally mounted b means of the journal 12 extending through the casing. The upper part of the casing is provided with the connectinge e 13 and the lower: part with the contracted tubular passage ].4 through whichone end of the rope passes, as indicated in Fig. 2. Within the lower portion of the casing the locking block 15 is mounted b means of the pivot 16 dis posed at one en of the block. The block is provided with the curved contact face 17 adapted to contact with the straight inner face 18 of the casing so as to secure a positive locking contact upon the rope passing between these parts.

For the purpose of operating the locking block the curved arm 19 extends from the upper face thereof and is provided at its outer end with the eye 20 through which the rope may pass, and the gripping socket 21 disposed at. one side thereof into which the rope may be drawn laterally in order to frictionally engage it with the arm for the posi-- .tive operation thereof'when desired.

In the operation of the invention it will be seen that the rope asses through the eye of the arm from the oeking block in contact with the curved face of said arm, thence ove the sheave and between the block and the side of the pulley casing, as shown in Fig. 2. WVhen in this position the pulley will auto-- matically lock itself when the lifting tensior upon the right end of the rope is relieved am the block rests in firm contact with the ropr so as to secure a positive gripping upon tl'l-L" rope without danger of cutting or 1I1j111111 the same. When it'be desired to lower th object from the pulley, the ri ht end of the rope may be drawn toward the pulley and into contact with the curved face of the am. so as to lift the block out of locking contact and by riding upon this face of thearm hold the block in this position so that the v'eigh may be lowered to the desired extent. The structure of the engaging socket at the end of the arm is such that the rope may be drawn laterally into frictional engagement therewith and so held to positively actuate the arm and block in any movement of the rope. This is important under numerous conditions, particularly when owing to the strain of the weight the block has been drawn or jammed into such firm contact with the rope that it cannot be readily released therefrom. Under such conditions the rope is drawn out-- ward or away from the pulley into the sockez of the arm and by its frictional en agement therewith secures the necessary hold and leverage to release the block. It will also be observed that the construction of the pulley casing is especially adapted for the operation of these parts and uiding the rope thereto so as to form a simp e, very efficient and economically constructed locking pulley.

Having described 111 invention and set forth its merits, what I claim and desire to secure b Letters Patent is 1. A ocking pulley comprising a casing having a locking-wall with an a site thereto, a sheave pivoted within said casing, alockin block pivotally mounted opposite said wail, an o erating arm extended laterally through said from the block pivot and provided at its free end with a guiding eye beyond said casing, and a curved lever face upon said arm intermediate the block pivot and eye.

erture oppoaperture for a distance having a passage extending therethrough, a sheave pivoted therein, a contracted tubular mg 2. A lockingpulley comprising a casing [having a passage therein, a locking block pivotally mounted in said casing, an operatarm extended from said b ock beyond lower end to said casing having a locking said casing and provided witha guiding eye Wall, a locking block opposite said Wall, an at its free end, and a laterally disposed gripoperating arm from said block having a ping socket communicating with said eye. curved face in contact with which a rope is In testimony whereof I affix mysignature adapted to travel and a guiding eye at the in presence of two witnesses. outer end of said face, and a gripping socket PETE-R A. NELSON. disposed laterally at one side of said eye and in communication therewith.

3. A locking casing comprising a casing Witnesses:

SEWARD MARTIN, R. G. lVION TGQMERSQ. 

